go resource_error ai_generated true

fatal error: out of memory allocating heap arena metadata

ID: go/goroutine-count-explosion

Also available as: JSON · Markdown · 中文
80%Fix Rate
87%Confidence
0Evidence
2024-08-15First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.19 active — — —
1.21 active — — —
1.22 active — — —

Root Cause

Unbounded go statement per incoming request or per item spawns millions of goroutines, exhausting memory.

generic

中文

对每个传入请求或每个条目无限制地使用 go 语句，生成数百万个 goroutine，耗尽内存。

Workarounds

  1. 95% success 
    sem := make(chan struct{}, 100)
for _, item := range items {
    sem <- struct{}{}
    go func(it Item) {
        defer func() { <-sem }()
        process(it)
    }(item)
}
  2. 93% success 
    jobs := make(chan Job, 1000)
for i := 0; i < runtime.NumCPU(); i++ {
    go func() {
        for j := range jobs { process(j) }
    }()
}

Dead Ends

Common approaches that don't work:

  1. 85% fail

    Goroutine stacks dominate memory; GC tuning does not reduce goroutine count.

  2. 70% fail

    GOMEMLIMIT forces GC but goroutines keep spawning; OOM still occurs or throughput collapses.